Ụlọ ọrụ anyị bụ ọkachamara n'ịrụ ọrụ na mmepe, mmepụta, nrụpụta na ire ihe mgbakwunye nke ihe ndị na-egwupụta ihe. Ngwaahịa ndị bụ isi bụ ogwe aka dayamọnd, ogwe aka ọwara na ogwe aka hama. A na-eji ngwaahịa ndị a eme ihe n'iwu ụzọ, iwu ụlọ, iwu ụgbọ okporo ígwè, igwu ala, iwepụ permafrost, wdg.
